Where is the user's Subversion config file stored on the major operating systems?
~/.subversion/config
or
/etc/subversion/config
for Mac/Linux
and
%appdata%\subversion\config
for Windows
In windows 7, 8, and 10 you can find at the following location
C:\Users\<user>\AppData\Roaming\Subversion
If you enter the following in the Windows Explorer address bar, it will take you right there.
%appdata%\Subversion
Not sure about Win but n *nix (OS X, Linux, etc.) its in ~/.subversion